Search for Heavy Neutrinos in $K^{+}\to {\mu }^{+}{\nu }_{\mu }$ Decays

The NA62 Collaboration

The NA62 experiment recorded a large sample of $K^{+}\to {\mu }^{+}{\nu }_{\mu }$ decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence…